Looks like we're getting a bigger 'Prison Break' reunion than expected. We found out that Robert Knepper would return to the DC TV Universe on 'The Flash' as Clock King, and that Peter Stormare would take on the role of Count Vertigo on 'Arrow.' We also learned that Wentworth Miller would play the Rogues villain Leonard Snart aka Captain Cold in episode four of 'The Flash.' Now we learn that joining Miller in episode four would be Dominic Purcell as Mick Rory aka Heat Wave.